Ich

[Aquaria]

8 weeks for ich to die off as for stocking we would need more info on your tank and unless you setup a proper QT tank you are just going to reintroduce ich when you start stocking again

[MarkoD]

this happen to me about 2 months ago

3 of my fish survived.

i added a UV sterilizer and added fish a month later.

everything has been good for a month now.

im not gonna say a sterilizer helped or fixed it. but i personally wouldnt have a saltwater tank without a sterilizer again.